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# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
"""Checker for features used that are not supported by all python versions
indicated by the py-version setting.
"""
from astroid import nodes
from pylint.checkers import BaseChecker
from pylint.checkers.utils import check_messages
from pylint.interfaces import IAstroidChecker
from pylint.lint import PyLinter
from pylint.utils import get_global_option
class UnsupportedVersionChecker(BaseChecker):
"""Checker for features that are not supported by all python versions
indicated by the py-version setting.
"""
__implements__ = (IAstroidChecker,)
name = "unsupported_version"
msgs = {
"W1601": (
"F-strings are not supported by all versions included in the py-version setting",
"using-f-string-in-unsupported-version",
"Used when the py-version set by the user is lower than 3.6 and pylint encounters "
"a f-string.",
),
}
def open(self) -> None:
"""Initialize visit variables and statistics."""
py_version = get_global_option(self, "py-version")
self._py36_plus = py_version >= (3, 6)
@check_messages("using-f-string-in-unsupported-version")
def visit_joinedstr(self, node: nodes.JoinedStr) -> None:
"""Check f-strings"""
if not self._py36_plus:
self.add_message("using-f-string-in-unsupported-version", node=node)
def register(linter: PyLinter) -> None:
"""Required method to auto register this checker"""
linter.register_checker(UnsupportedVersionChecker(linter))
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